If you use the Amazon Kindle app on your Apple device, you should not install the 3.6.1 update for the app.
UPDATE: Amazon has released a 3.6.2 update and removed the warning about the previous edition. The new release includes “Fix for Registration Issue” and “Various Bug Fixes and Security Fixes”
Do you like reading eBooks on your iPhone or iPad using Amazon’s Kindle app? Then here’s a tip, don’t download the latest update 3.6.1. This advice is coming straight from Amazon. The company posted this note on the app’s listing in iTunes: “There is a known issue with this update. If you are an existing Kindle for iOS user, we recommend you do not install this update at this time.”